subpoena ad tes·ti·fi·can·dum /-ˌædˌtɛstəfɪˈkændəm/
Sub·poe·na n. Law A writ commanding the attendance in court, as a witness, of the person on whom it is served, under a penalty; the process by which a defendant in equity is commanded to appear and answer the plaintiff's bill. [Written also subpena.]
Subpoena ad testificandum A writ used to procure the attendance of a witness for the purpose of testifying. -- Subpoena duces tecum A writ which requires a witness to attend and bring certain documents.
subpoena ad testificandum
n : a writ issued by court authority to compel the attendance of
a witness at a judicial proceeding; disobedience may be
punishable as a contempt of court [syn: subpoena]